[8.x] [Expandable Flyout] - customize default right, left and preview widths for push mode (#206155)#210117

PhilippeOberti merged 2 commits intoelastic:8.xelastic/kibana:8.xfrom

PhilippeOberti:backport/8.x/pr-206155PhilippeOberti/kibana:backport/8.x/pr-206155Copy head branch name to clipboard